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Main Assembly

Wishlist Follow Ignore Install Unwatch Watch
App ID 1078920
App Type Game
Developer
Publisher Team17
Supported Systems Windows
Technologies Unreal Engine
Last Changenumber 28983991
Last Record Update 14 May 2025 – 15:23:44 UTC ()
Release Date 26 January 2021 – 16:00:00 UTC ()
😎 80.39%
1k reviews
1
In-Game
+4
🧊 3D 👥 Online Co-Op 🤝 Co-op 🧱 Sandbox 🏠 Building

You’re the designer, engineer and architect if you can imagine it you can create it! Construct robots of any shape or size from eight-legged spider bots to eerie UFO contraptions.

Additional Information

Developer Bad Yolk Games
metacritic_name Main Assembly
controller_support partial
community_visible_stats Yes
workshop_visible Yes
ReleaseState released
Publisher Team17
eulas
0 ↴
id1078920_eula_0
nameMain Assembly EULA
urlhttps://store.steampowered.com//eula/1078920_eula_0
version1
Store Release Date 26 January 2021 – 16:01:15 UTC ()
osarch 64
community_hub_visible Yes
Social Media https://discord.gg/mainassembly
https://www.facebook.com/BadYolkGames/
https://www.twitch.tv/badyolkgames
https://x.com/BadYolkGames
https://www.youtube.com/channel/UChbuHV7NUa4P69fiy5zDOhw/
Primary Genre Simulation (28)
Store Genres Simulation (28)
Steam Release Date 26 January 2021 – 16:00:00 UTC ()
Store Asset Modification Time 10 November 2022 – 09:04:06 UTC () (1668071046)
library_assets
library_capsuleen
library_heroen
library_logoen
logo_position ↴
pinned_positionCenterCenter
width_pct66.82206724376545
height_pct100
osextended empty string
review_score 8
review_percentage 84
Detected Technologies (?) Unreal Engine, CEF SDK, NVIDIA_APEX SDK, NVIDIA_Nsight_Aftermath SDK, NVIDIA_PhysX SDK, NvCloth SDK, Ogg SDK, Vorbis SDK
Steam Deck Compatibility
  • Steam Deck:
  • Some functionality is not accessible when using the default controller configuration, requiring use of the touchscreen or virtual keyboard, or a community configuration
  • This game sometimes shows mouse, keyboard, or non-Steam-Deck controller icons
  • Entering some text requires manually invoking the on-screen keyboard
  • In-game interface text is legible on Steam Deck
  • This game's default graphics configuration performs well on Steam Deck
  • Note: This game does not default to external Bluetooth/USB controllers on Deck, and may require manually switching the active controller via the Quick Access Menu
  •  
  • SteamOS:
  • This game runs successfully on SteamOS
  • Note: Entering some text requires manually invoking the on-screen keyboard
  • Note: Some functionality is not accessible when using the default controller configuration, requiring use of the touchscreen or virtual keyboard, or a community configuration
  • Note: This game does not default to external Bluetooth/USB controllers on SteamOS, and may require manually switching the active controller via the Quick Access Menu
  •  
  • category: Playable
  • steamos_compatibility: Compatible
  • test_timestamp: 5 March 2022 – 00:00:00 UTC
  • tested_build_id: 6123531
  • configuration:
    supported_inputgamepad
    requires_manual_keyboard_invoke1
    requires_non_controller_launcher_nav0
    primary_player_is_controller_slot_01
    non_deck_display_glyphs1
    small_text0
    requires_internet_for_setup0
    requires_internet_for_singleplayer0
    recommended_runtimeproton-experimental
    requires_h2640
    requires_voice_files0
    gamescope_frame_limiter_not_supported0
    hdr_support0
Early Access Release Date 11 June 2020 – 00:00:00 UTC ()
First seen on SteamDB 30 April 2019 – 12:27:56 UTC (), in changelist #6175879

Supported Languages

10 Languages Interface Full Audio Subtitles Achievements
English Yes Yes Yes Yes
French Yes Yes Yes
Italian Yes Yes Yes
German Yes Yes Yes
Spanish - Spain Yes Yes Yes
Russian Yes Yes Yes
Simplified Chinese Yes Yes Yes
Traditional Chinese Yes Yes Yes
Portuguese - Brazil Yes Yes Yes
Japanese Yes Yes Yes

Tags

🧊 3D 👥 Online Co-Op 🤝 Co-op 👤 Singleplayer 🧱 Sandbox 🏠 Building 🖥️ Simulation 💻 Programming 🤖 Robots 🔋 Physics 🤖 Artificial Intelligence 🔬 Science 🔧 Crafting 💼 Management 🧩 Logic 🕹️ Multiplayer 🤖 Automation 🌎 Immersive Sim 🏫 Education 🦹 Character Customization

Categories

Single-player Online PvP Online Co-op Steam Achievements Steam Workshop Steam Cloud Includes level editor Family Sharing Multi-player Co-op Cloud Gaming Cloud Gaming (NVIDIA) PvP

Hardware Categories

Partial Controller Support

Assets

Load all asset images
clienticon c6dac08bbaf164918a980933f4029c90ddd676b5
clienttga 5ba9ec1e31222a541c77a09ad74999a7c75caa41
icon 372ee3533572c5b29a5fffd0f096b3cdc9c8e8f9
logo 73710968d1adda2b6fcee1cb9e319f617891a5e1
logo_small 73710968d1adda2b6fcee1cb9e319f617891a5e1_thumb
small_capsule
englishcapsule_231x87.jpg
header_image
englishheader.jpg
library_assets_full
library_capsule ↴
image/englishlibrary_600x900.jpg
image2x/englishlibrary_600x900_2x.jpg
library_hero ↴
image/englishlibrary_hero.jpg
image2x/englishlibrary_hero_2x.jpg
library_logo ↴
logo_position/pinned_positionCenterCenter
logo_position/width_pct66.82206724376545
logo_position/height_pct100
image/englishlogo.png
Assets
main_capsulecapsule_616x353.jpg
small_capsulecapsule_231x87.jpg
headerheader.jpg
page_backgroundpage_bg_generated_v6b.jpg
hero_capsulehero_capsule.jpg
library_capsulelibrary_600x900.jpg
library_capsule_2xlibrary_600x900_2x.jpg
library_herolibrary_hero.jpg
library_hero_2xlibrary_hero_2x.jpg
community_icon372ee3533572c5b29a5fffd0f096b3cdc9c8e8f9.jpg
page_background_pathapp/1078920
raw_page_backgroundpage_bg_raw.jpg
timestamp15 October 2024 – 14:38:28 UTC

Trailer 343310 ↴

trailer_name Release Out of Early Access
trailer_category 0
trailer_480p ↴
video/webm 256819722/movie480_vp9.webm
video/mp4 256819722/movie480.mp4
trailer_max ↴
video/webm 256819722/movie_max_vp9.webm
video/mp4 256819722/movie_max.mp4
microtrailer ↴
video/webm 1078920/343310/da2e717a7db9da6cd4d10251b0232bfd0ec1b8ed/1750613137/microtrailer.webm
video/mp4 1078920/343310/da2e717a7db9da6cd4d10251b0232bfd0ec1b8ed/1750613137/microtrailer.mp4
adaptive_trailers ↴
dash_av1 1078920/343310/da2e717a7db9da6cd4d10251b0232bfd0ec1b8ed/1750613137/dash_av1.mpd
dash_h264 1078920/343310/da2e717a7db9da6cd4d10251b0232bfd0ec1b8ed/1750613137/dash_h264.mpd
hls_h264 1078920/343310/da2e717a7db9da6cd4d10251b0232bfd0ec1b8ed/1750613137/hls_264_master.m3u8
screenshot_medium 256819722/movie.293x165.jpg
screenshot_full 256819722/movie_full.jpg
all_ages true
is_highlight true
timestamp 5 August 2021 – 10:48:32 UTC

Trailer 339053 ↴

trailer_name Release Date Announcement
trailer_category 0
trailer_480p ↴
video/webm 256817430/movie480_vp9.webm
video/mp4 256817430/movie480.mp4
trailer_max ↴
video/webm 256817430/movie_max_vp9.webm
video/mp4 256817430/movie_max.mp4
microtrailer ↴
video/webm 1078920/339053/daf19dca0451c3437c4da559b3c5e414f739ac73/1750613131/microtrailer.webm
video/mp4 1078920/339053/daf19dca0451c3437c4da559b3c5e414f739ac73/1750613131/microtrailer.mp4
adaptive_trailers ↴
dash_av1 1078920/339053/daf19dca0451c3437c4da559b3c5e414f739ac73/1750613131/dash_av1.mpd
dash_h264 1078920/339053/daf19dca0451c3437c4da559b3c5e414f739ac73/1750613131/dash_h264.mpd
hls_h264 1078920/339053/daf19dca0451c3437c4da559b3c5e414f739ac73/1750613131/hls_264_master.m3u8
screenshot_medium 256817430/movie.293x165.jpg
screenshot_full 256817430/movie_full.jpg
all_ages true
is_highlight true
timestamp 7 January 2021 – 17:17:48 UTC

Trailer 325402 ↴

trailer_name Bot Brawl Update Trailer
trailer_category 0
trailer_480p ↴
video/webm 256808807/movie480_vp9.webm
video/mp4 256808807/movie480.mp4
trailer_max ↴
video/webm 256808807/movie_max_vp9.webm
video/mp4 256808807/movie_max.mp4
microtrailer ↴
video/webm 1078920/325402/04ad2cd2c8477bb2d6fe4fae8453ebc474d6f5e5/1750613127/microtrailer.webm
video/mp4 1078920/325402/04ad2cd2c8477bb2d6fe4fae8453ebc474d6f5e5/1750613127/microtrailer.mp4
adaptive_trailers ↴
dash_av1 1078920/325402/04ad2cd2c8477bb2d6fe4fae8453ebc474d6f5e5/1750613127/dash_av1.mpd
dash_h264 1078920/325402/04ad2cd2c8477bb2d6fe4fae8453ebc474d6f5e5/1750613127/dash_h264.mpd
hls_h264 1078920/325402/04ad2cd2c8477bb2d6fe4fae8453ebc474d6f5e5/1750613127/hls_264_master.m3u8
screenshot_medium 256808807/movie.293x165.jpg
screenshot_full 256808807/movie_full.jpg
all_ages true
is_highlight true
timestamp 11 November 2020 – 11:21:07 UTC

Trailer 310541 ↴

trailer_name 1k Workshop Creations
trailer_category 0
trailer_480p ↴
video/webm 256800068/movie480_vp9.webm
video/mp4 256800068/movie480.mp4
trailer_max ↴
video/webm 256800068/movie_max_vp9.webm
video/mp4 256800068/movie_max.mp4
microtrailer ↴
video/webm 1078920/310541/ee62fae87f029891a8bb4aaf1fe6c63366a446c0/1750613126/microtrailer.webm
video/mp4 1078920/310541/ee62fae87f029891a8bb4aaf1fe6c63366a446c0/1750613126/microtrailer.mp4
adaptive_trailers ↴
dash_av1 1078920/310541/ee62fae87f029891a8bb4aaf1fe6c63366a446c0/1750613126/dash_av1.mpd
dash_h264 1078920/310541/ee62fae87f029891a8bb4aaf1fe6c63366a446c0/1750613126/dash_h264.mpd
hls_h264 1078920/310541/ee62fae87f029891a8bb4aaf1fe6c63366a446c0/1750613126/hls_264_master.m3u8
screenshot_medium 256800068/movie.293x165.jpg
screenshot_full 256800068/movie_full.jpg
all_ages true
is_highlight true
timestamp 7 January 2021 – 17:18:04 UTC

Trailer 292602 ↴

trailer_name FGS Trailer
trailer_category 0
trailer_480p ↴
video/webm 256789387/movie480_vp9.webm
video/mp4 256789387/movie480.mp4
trailer_max ↴
video/webm 256789387/movie_max_vp9.webm
video/mp4 256789387/movie_max.mp4
microtrailer ↴
video/webm 1078920/292602/b9829405cf290fa4dd20ff94c4f878f33ef21a88/1750613112/microtrailer.webm
video/mp4 1078920/292602/b9829405cf290fa4dd20ff94c4f878f33ef21a88/1750613112/microtrailer.mp4
adaptive_trailers ↴
dash_av1 1078920/292602/b9829405cf290fa4dd20ff94c4f878f33ef21a88/1750613112/dash_av1.mpd
dash_h264 1078920/292602/b9829405cf290fa4dd20ff94c4f878f33ef21a88/1750613112/dash_h264.mpd
hls_h264 1078920/292602/b9829405cf290fa4dd20ff94c4f878f33ef21a88/1750613112/hls_264_master.m3u8
screenshot_medium 256789387/movie.293x165.jpg
screenshot_full 256789387/movie_full.jpg
all_ages true
timestamp 9 November 2020 – 16:11:51 UTC

User File System

Key Value
quota 953.67 MiB (1000000000)
maxnumfiles 10000
savefiles
0 ↴
rootWinAppDataLocal
pathRoboBuild/Saved/bots
pattern*
recursive1
2 ↴
rootWinAppDataLocal
pathRoboBuild/Saved/SaveGames
pattern*.sav
3 ↴
rootWinAppDataLocal
pathRoboBuild/Saved/levels
pattern*
recursive1
4 ↴
rootWinAppDataLocal
pathRoboBuild/Saved/kits
pattern*
recursive1

Save File Locations

Based on the configuration above, this is where we think the save files are located.

Read more about cloud saves in Steamworks documentation.

Platform Path Pattern
[All OSes] %USERPROFILE%/AppData/Local/RoboBuild/Saved/bots *
[All OSes] %USERPROFILE%/AppData/Local/RoboBuild/Saved/SaveGames *.sav
[All OSes] %USERPROFILE%/AppData/Local/RoboBuild/Saved/levels *
[All OSes] %USERPROFILE%/AppData/Local/RoboBuild/Saved/kits *
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